Question

The centrifuge consists of a centrifuge tube holder called:
A.Motor
B.Rotor
C.Moving tube
D.Both a and b

Answer 1

Hint: The apparatus used for centrifugation is called a centrifuge. It works on the principle of Sedimentation.

Complete step by step answer:
Centrifugation is a technique used for the separation of particles from a solution according to their size, shape, density, viscosity of the medium and rotor speed.
The particles are suspended in a liquid medium and placed in a centrifuge tube. The tube is then placed in a rotor and spun at a defined speed. At the same time, objects that are less dense are displaced and move to the centre. In a laboratory centrifuge that uses sample tubes, the radial acceleration causes denser particles to settle to the bottom of the tube, while low-density substances rise to the top.
Separation through sedimentation could be done naturally with the earth gravity, nevertheless, it would take ages. Centrifugation is making that natural process much faster.
Rotation of the rotor about a central axis generates a centrifugal force upon the particles in the suspension. At a fixed centrifugal force and liquid viscosity, the sedimentation rate of a particle is proportional to its size (molecular weight) and to the difference between the particle density and the density of the solution.

So, the correct option is B.

Note:
It is the rotor that holds the balanced centrifugal tubes of equal amounts of the solid-liquid mixture and spins about fixed centrifugal force for sedimentation to occur.